Phosphorylated thiourea compositions

ABSTRACT

WHEREIN X CAN BE SELECTED FROM OXYGEN AND SULFUR, R AND R1 CAN BE THE SAME OR DIFFERENT AND CAN BE SELECTED FROM LOWER ALKYL AND LOWER ALKOXY, R2 CAN BE SELECTED FROM LOWER ALKYL, LOWER ALKOXY AND LOWER THIOALKYL. THE COMPOUNDS ARE USEFUL FUNGICIDES AND BIOCIDES.   1-(R1-P(=X)(-R)-NH-),2-(R2-CO-NH-C(=S)-NH-)BENZENE   NEW COMPOUNDS CORRESPONDING TO THE GENERIC FORMULA:

United States Patent $781,326 PHOSPHORYLATED 'iHIOUREA COMPOSITIONS Alexander Mihailovski, 1812 Delaware St., Berkeley, Calif. 94703, and Don R. Baker, 15 Muth Drive, Orinda, Calif. 94563 No Drawing. Original application Dec. 29, 1971, Ser. No. 213,714. Divided and this application Feb. 26, 1973, Ser. No. 336,111

Int. Cl. C07f 9/22 US. Cl. 260470 3 Claims ABSTRACT OF THE DISCLOSURE New compounds corresponding to the generic formula: ii/ NH-P-Ri wherein X can be selected from oxygen and sulfur, R and R can be the same or different and can be selected from lower alkyl and lower alkoxy, R can be selected from lower alkyl, lower alkoxy and lower thioalkyl. The compounds are useful fungicides and biocides.

This is a division of application Ser. No. 213,714 filed Dec. 29, 1971.

DESCRIPTION OF THE INVENTION This invention is directed to a novel group of compounds which may be generally described as phosphorylated thioureas which are highly active fungicides and biocides. The compounds of the present invention are represented by the generic formula:

wherein X can be selected from oxygen and sulfur, R and R can be the same or difierent and can be selected from lower alkyl and lower alkoxy, R can be selected from lower alkyl, lower alkoxy and lower thioalkyl.

The above compounds can be prepared by phosphorylating o-phenylenediamine on one amino group, followed by treatment of the resulting phosphorylated aniline with a carbonyl isothiocyanate in an inert solvent such as acetone, benzene and the like. The products form rapidly and can be isolated in good purity from the solvent systern.

In order to illustrate the merits of the present invention the following examples are provided.

EXAMPLE 1 Preparation of 2-[3-(methoxycarbonyl)-thioureido]- 0,0-diethylphosphoranilide Into a 500 ml, four-neck, round-bottom flask provided with paddle stirrer, thermometer and dropping funnel were placed 20.0 grams (0.185 mole) o-phenylenediamine, 18.8 grams (0.185 mole) triethylamine and 200 ml. of chloroform. To this mixture were then added 31.9 grams (0.185 mole) 0,0-diethylphosphorochloridate dissolved in 40 ml. chloroform while the reaction temperature was maintained below 30 C. by cooling the flask in an ice bath. After the addition had been completed, the reagents were stirred for another 17 hours at room temperature. The resulting chloroform solution was washed twice with 100 ml. portions of water, dried and the solvent evaporated to give crude (N-2 aminophenyl)-0,0=diethylphosphortoo amidate. Upon recrystallization from carbon tetrachloride, 32.5 grams of this product were obtained. Then, 4.6 grams (0.019 mole) N-(2-amino-pheny1)-0,0-diethylphosphoramidate was dissolved in 30 ml. benzene. To this solution was added slowly 2.2 grams (0.019 mole) methoxycarbonyl isothiocyanate dissolved in 10 ml. benzene. The reaction mixture was stirred for about 16 hours at room temperature. A colorless precipitate formed. The solid was filtered and dried to yield 4.6 grams of 2-[3'- (methoxycarbonyl)thioureido] 0,0 diethylphosphorylanilide, M.P. 154-155 C. (dec.). Yield, 67% of theory.

EXAMPLE 2 Preparation of 2- [3 (methoxycarbonyl) -thioureido] -O- ethyl-P-ethylthiophosphonanilide N-(Z-aminophenyl) O ethyl- -ethylthiophosphonamidate was prepared from o-phenylenediamine and O- ethyl-P-ethylthiophosphonochloridate under conditions similar to those described for N(2-aminophenyl)-0,0-diethylphosphoramidate in Example 1. To 5.0 grams (0.020 mole) N-(2 aminophenyl)-O-ethyl-P-ethylthiophosphonamidate in 20 ml. benzene was added a solution of 2.4 grams (0.020 mole) methoxycarbonyl isothiocyanate dissolved in 10 ml. benzene. The precipitated solid was filtered and dried to yield 5.6 grams of 2-[3'-methoxycarbonyl)-thioureido] O ethyl-P-ethylthiophosphonanilide, M.P. 172-173 C. (dec.). Yield, 76% of theory.

Other compounds were prepared in an analogous manner starting with the appropriate starting materials as outlined above. The following is a table of compounds representative of those embodied by the present invention. Compound numbers have been assigned to them and are used for identification throughout the balance of the specification.

Compound number mwmmmmommmmmmmooo -OCHgCHs --OCH2C I *0 CHQCH Same as above.

(A) Foliar preventative sprays (1) Bean rust.The chemicals are dissolved in an appropriate solvent and diluted with water containing several drops of Tween 20, a'wetting agent. Test concentrations, ranging from 1 000 p.p.m. downward, are sprayed to runoff on the primary leaves of pinto beans (Phaseolus vulgaris L.). After the leaves are dried, they are inoculated with a water suspension of spores of the bean rust fungus (Uromyces phas'eoli Arthur) and the plants are placed in an environment of 100% humidity for 24 hours. The plants are then removed from the humidity chamber and held until disease pustules appear on the leaves. Effectiveness is recorded as the lowest concentration, in p.p.m., which will provide 50% reduction in pustule formation as compared to untreated, inoculated plants.

(2) Bean powdery mildew. Test chemicals are prepared and applied in the same manner as for the bean rust test. After the plants are dry, the leaves are dusted with spores of the powdery mildew fungus (Erysiphe polygoni De Candolle) and the plants are retained in the greenhouse until the fungal growth appears on the leaf surface. Effectiveness is recorded as the lowest concentration, in p.p.m., which will provide 50% reduction in pustule formation as compared to untreated, inoculated plants.

(3) Tomato early blight.Test chemicals are prepared and applied in the same manner as the bean rust and powdery mildew tests except that 4-week old tomato (Lycopersz'con esculentum) plants are utilized as the host plant. When the leaves are dry, they are inoculated with a water suspension of spores of the early blight fungus (Alternaris solani Ellis and Martin) and placed in an environment of 100% humidity for 48 hours. The plants are then removed from the humidity chamber and held until disease lesions appear on the leaves. Effectiveness is recorded as the lowest concentration, in p.p.m., which will provide 50% reduction in number of lesions formed as compared to untreated, inoculated plants.

(B) Tube systemic test (1) Bean rust.The chemicals are dissolved in an appropriate solvent and diluted with tap water to a series of descending concentrations beginning at 50 p.p.m. Sixty ml. of each concentration are placed in a test tube. A pinto bean plant is placed in each tube and supported with a piece of cotton so that only the roots and lower stern are in contact with the test solution. Forty-eight hours later the bean leaves are inoculated with a water suspension of spores of the bean rust fungus and placed in an environment with 100% humidity for 24 hours. The plants are then removed from the humidity chamber and maintained in the greenhouse until the disease pustules appear on the leaves. Effectiveness is recorded as the lowest concentration, in p.p.m., which will provide 50% reduction in pustule formation as compared to untreated, inoculated plants.

(2) Bean powdery mildew.--Test chemicals are prepared and applied in the same manner as for the bean rust systemic test. After two days the leaves are dusted with spores of the powdery mildew fungus and maintained in greenhouse until mycelial growth appears on the leaf surfaces. Effectiveness is recorded as the lowest concentration, in p.p.m., which will provide a 50% reduction in mycelial growth on the leaf surface as compared to untreated, inoculated plants.

(C) Systemic soil drench (1) Bean rust.Pinto beans are grown in l-pint ice cream cartons, each containing 1 lb. of soil. Aliquots of the toxicant, dissolved in an appropriate solvent, are diluted with 25 ml. of water and drenched onto the soil surface. Two days later the bean leaves are inoculated with a water suspension of spores of the rust fungus, and the plants are placed in an environment with 100% humidity for 24 hours. The plants are then removed from the "humidity chamber and maintained in the greenhouse until the pustules appear on the leaves. Eifectiveness is recorded as the minimum concentration, in p.p.m. per lb. of soil, which will provide 50% reduction in number of pustules as compared to untreated inoculated plants;

(2) Bean powdery mildew-The bean plants and chemicals are prepared and applied asin the rust systemic soil drench test. After ten days, the bean leaves are dusted with spores of the powdery mildew fungus and maintained in the greenhouse until the mycelial growthappears on the leaf surface. Effectiveness is recorded as the minimum concentration, in p.p.m. per 1b. of, soil, which will provide 50% reduction in mycelial growth on the leaf surface in comparison to untreated, inoculated plants.

The results of these tests are tabulated in Table H.

TABLE II Foliar spray Soil drench Com- Tube systemic pound Tomato Mil- No. Rust Mildew blight Rust Mildew Rust dew BIOCIDE TESTtING PROCEDURES Tubes of sterilized nutrient and malt extract broth are prepared. Aliquots of the toxicant, dissolved in an appropriate solvent, are injected through the stopper, into the broth, to provide concentrations ranging from 50 p.p.m. downward. The test organisms consist of two fungi, Aspergillus niger (A.n.) Van Tieghem and Penicillium italicum (P.i.) Wehmer, and two bacteria, Escherichia cali (E.c.) Migula and Staphylococcus aureus (S.a.) Rosenbach. Three drops of a spore suspension of each of the fungi are injected into the tubes of malt broth and three drops of the bacteria are injected into the nutrient broth. One week later the growth of each organism is observed and effectiveness of the chemical is recorded as the lowest concentration in p.p.m. which provides 50% inhibition of growth as compared to untreated inoculated tubes. The results of these tests are tabulated in Table HI.

TABLE III Compound number Am P1. 13.0. 8.11.

No'rn.-( )zPartial control.

The compounds of this invention are generally embodied into a form suitable for convenient application. For example, the compounds can be embodied into pesticidal composition which are provided in the form of emulsions, suspensions, solutions, dusts and aerosol sprays. In general, such compositions will contain, in addition to the active compound, the adjuvants which are found normally in pesticide preparations. In these compositions, the active compounds of this invention can be employed as the sole pesticide component or the'y can be used in admixture with other compounds having similar utility. The pesticide compositions of this invention can contain, as adjuvants, organic solvents, such as sesame oil, xylene range solvents, heavy petroleum, etc.; water; emulsifying agents; surface active agents; talc; pyrophyllite; diatomite; gypsum; clays, propellanas, such as dichlorodifluoromethane, etc. If desired, however, the active compounds can be applied directly to feedstulfs, seeds, etc. upon which the pests feed. When applied in such a manner, it will be advantageous to use a compound which is not volatile. lIn connection with the activity of the presently disclosed pesticidal compounds, it should be fully understood that it is not necessary that they be active as such. The purposes of this invention will be fully served it the compound is rendered active by external influences, such as light or by some physiological action which occurs'when the compound is ingested into the body of the pest.

The precise manner in which the pesticidal compositions of this invention are used in any particular instance will be readily apparent to a person skilled in the art. Generally, the active pesticide compound. will be embodied in the form of a liquid composition; for example, an emulsion, suspension, or aerosol spray. While the conwherein X is sulfur, R and R can be the same or diiferent and can be selected from lower alkyl, R is lower alkoxy.

2. A compound as set forth in claim 1 wherein X is sulfur, R is CH2CH3, R1 is *CHZOH3 and R2 is 0CH;,.

3. A compound as set forth in claim 1 wherein X is sulfur, R is -OH CH R is CH CH and R is -0CH CH References Cited UNITED STATES PATENTS 3,136,801 6/ 1964 Hopkins et a1. 260-470 LORRAINE A. WEIN-BERGER, Primary Examiner M. L. SI-IIPPEN, Assistant Examiner US. Cl. X.R. 424211 mg? UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent NO. 2 7311326 Dated December 25, 1973 Inventor-(S) Alexander Mihailovski and Don R. Baker It is certified-that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

F- I. On Page 1, in the patent heading, the phrase ---assignor to Stauffer Chemical Company, New York,

N f should be inserted.

. Signed and sealed this 29th day of October 1974.

' (SEAL) Attest:

McCOY M. GIBSON JR. I c. MARSHALL DANN Attesting Officer Commissioner of Patents 

